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Some interesting tidbits of information
>Misty and Brock came back because the staff didn't feel like it wouldn't feel like a grand finale if the anime ended with new characters like Goh and Koharu
>At the end of SM Ash said he still wasn't a master, despite being a regional champion, so the anime staff decided to take his goal a step further and make him a world champion in the PWCs (they still hadn't decided on what pokemon master meant at the start of journeys)
>The original plot for the final episode of the anime was later reused in The Distant Blue Sky (it was going to be essentially the same but without the ghost kid's plot. Ash meets pokémon and battles trainers on his way to Tonari town to meet his father. At the end he would receive his original cap, which would make the viewer feel like Ash's life is like a loop)
>Ever since they decided to end Ash's story, they knew it had to be an open ending. They had to make it clear to the viewer that Ash's adventures will never end.